<!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>Test</title>
<style>
article{width:300px;height:300px;border:solid 1px #f00;margin:auto}
body,html{width:100%;height:100%}
.t{position:absolute;width:100px;height:100px;border:solid 1px #000;}
</style>
</head>
<body>
<article></article>
<article>
<div class=t></div>
</article>
</body>
</html>